Fluidtight casing for watches



March 6, 1956 E. PIQUEREZ FLUIDTIGHT CASING FOR WATCHES Filed Feb. 1.1954 United States Patent FLUIDTIGHT CASING FOR WATCHES Ervin Piquerez,Bassecourt, Switzerland Application February 1, 1954, Serial No. 407,252Claims priority, application Switzerland November 2, 1953 6 Claims. (Cl.58-90) My invention has for its object a fluid-tight watch case.According to a. main object of my invention, the bottom of said case isprovided with at least two upstanding tongues extending in parallelismwith the axis of the case and fitted on the inside of the case band,said tongues including each an outer shoulder through which they engage,by means of a bayonet joint, a connecting member secured to the caseband and projecting inwardly with reference to the latter.

I have illustrated by way of example in accompanying drawings, twopreferred embodiments of my invention. in said drawings:

Fig. 1 is an axial cross-section of a portion of a fluidtight watch-caseaccording to a first embodiment;

Fig. 2 is a plan view of the connecting members on a smaller scale;

Fig. 3 is an elevational view of the case bottom, also on a smallerscale;

Fig. 4 is a plan view of the case bottom illustrated in Fig. 3;

Fig. 5 is a cross-sectional view, similar to that shown in Fig. l, ofthe second embodiment.

Fig. 6 is an elevational view of the connecting member in the secondembodiment on a smaller scale;

Fig. 7 is a plan view of the connecting member shown in Fig. 6.

Fig. 8 is an elevational view of the bottom of the case shown in Fig. 5,also on a smaller scale.

In the first embodiment, the fluid-tight case includes a cylindricalcase band 1 rigid with the rim, inside which is fitted the glass 2. Thecase band 1 is provided in its inner wall with an annular groove 3inside which is housed a spring wire 4 assuming the shape of an openannulus including two sections 4a (Fig. 2) projecting inwardly of thecasing and out of the groove 3. The bottom of the case which isindependent of the case band, is provided with two upstanding tongues 5aextending in parallelism with the axis of the case and provided eachwith an outwardly directed flange 5b (Figs. 3 and 4) adapted to engageafter the manner of a bayonet joint, the corresponding sections 4a ofthe spring 4. The surface 6 of each shoulder or flange 5b which engagesthe spring 4, assumes a frustoconical shape so that the radial pressureexerted by the spring 4 on the upstanding tongues 5a may produce anaxial pressure exerted by the bottom of the case on the cooperating edgeof the case band 1, said pressure compressing the packing 7 fittedbetween the said two parts of the case.

In the second embodiment, a flat ring 8 the cross-section of which isrectangular, is housed inside an annular groove 9 formed in thecylindrical inner wall of the case band 10. Said ring 8 is provided, asshown in Figs. 6 and 7, with two projections 8a extending radially andinwardly and the transverse ends of which are folded at 812 so as tofurther the assembly of the bottom 11 with the case band, through a kindof bayonet joint, said bottom being provided for this purpose, as in thepreceding case, with two upstanding lugs or tongues 11a rigid each atits upper end with an outwardly directed flange 11b (Fig. 8) adapted toengage said projections 8a on the ring 8. This embodiment operates thusin the same manner as the first embodiment illustrated in Figs. 1 to 4.

What I claim is:

l. A fluidtight watch case comprising a case bottom including at leasttwo upstanding tongues parallel with the axis of the case bottom and atequal distances from said axis, an outwardly directed shoulder rigidwith the upper end of each tongue, a case band extending on the outsideof the tongues coaxially with the axis of the case bottom and providedwith an annular groove in its inner surface to face the uprightsunderneath the shoulders thereon, an annular washer inserted between thelower edge of the case band and the cooperating outer edge of the casebottom, an open annular ring fitted in the groove in the case band andincluding sections projecting out of said groove towards the inside ofthe case and adapted to engage the underside of the correspondingupright shoulders for a predetermined relative angular position of thecase bottom with reference to the case band.

2. A fluidtight watch case comprising a case bottom including twodiametrically opposed upstanding tongues parallel with the axis of thecase bottom and at equal distances from said axis, an outwardly directedshoulder rigid with the upper end of each tongue, a case band extendingon the outside of the tongues coaxially with the axis of the case bottomand provided with an annular groove in its inner surface to face theuprights underneath the shoulders thereon, an annular washer insertedbetween the lower edge of the case band and the cooperating outer edgeof the case bottom, an open annular ring fitted in the groove in thecase band and including two diametrically opposed sections, projectingout of said groove towards the inside of the case and adapted to engagethe underside of the corresponding upright shoulders for a predeterminedrelative angular position of the case bottom with reference to the caseband.

3. A iluidtight watch case comprising a case bottom including twodiametrically opposed upstanding tongues parallel with the axis of thecase bottom and at equal distances from said axis, an outwardly directedshoulder rigid with the upper end of each tongue, a case band extendingon the outside of the tongues coaxially with the axis of the case bottomand provided with an annular groove in its inner surface to face theuprights underneath the shoulders thereon, an annular washer insertedbetween the lower edge of the case band and the cooperating outer edgeof the case bottom, an open annular ring fitted in the groove in thecase band and including two diametrically opposed sections, projectingout of said groove towards the inside of the case and adapted to engagethe underside of the corresponding upright shoulders for a predeterminedrelative angular position of the case bottom with reference to the caseband, said projecting sections having ends extending peripherally of theinner wall of the case band and shaped helically with reference to theaxis of the case.

4. A fiuidtight watch case comprising a case bottom including at leasttwo upstanding tongues parallel with the axis of the case bottom and atequal distances from said axis, an outwardly directed shoulder rigidwith the upper end of each tongue, a. case band extending on the outsideof the tongues coaxially with the axis of the case bottom and providedwith an annular groove in its inner surface to face the uprightsunderneath the shoulders thereon, an annular washer inserted between thelower edge of the case band and the cooperating outer edge of the casebottom, a split spring annulus fitted inside the groove and projectingout of said groove at points registering vertically with the location ofthe shoulders on the upstanding tongues for a predetermined relativeangular setting of the case band and bottom to engage tightly theunderside of said shoulders.

5. A fiuidtight watch case comprising a case bottom including at leasttwo upstanding tongues parallel with the axis of the case bottom and atequal distances from said axis, an outwardly directed shoulder rigidwith the upper end of each tongue, a case band extending on the outsideof the tongues coaxially with the axis of the case bottom and providedwith an annular groove of rectangular cross-section in its inner surfaceto face the uprights underneath the shoulders thereon, an annular washerinserted between the lower edge of the case band and the cooperatingouter edge of the case bottom, a split ring of substantially rectangularcross-section fitted inside the groove in the inner wall of the caseband and including projecting sections registering vertically with thelocation of the shoulders on the upstanding tongues for a predeterminedrelative angular setting of the case band and bottom to engage tightlythe underside of said shoulders.

V 6. A fiuidtight watch case comprising a case bottom including at leasttwo upstanding tongues parallel with the axis of the case bottom and atequal distances from said axis, an outwardly directed shoulder rigidwith the upper end of each tongue, and the lower surface of whichassumes a slope directed downwardly towards the axis of the case, a caseband extending on the outside of the tongues coaxially with the axis ofthe case bottom. and provided with an annular groove in its innersurface to face the uprights underneath the shoulders thereon, anannular washer inserted between the lower edge of the case band and thecooperating outer edge of the case bottom, an open annular ring fittedin the groove in the case band and including sections projecting out ofsaid groove towards the inside of the case and adapted to engage theunderside of the corresponding upright shoulders for a predeterminedrelative angular position of the case bottom with reference to the caseband.

References Cited in the file of this patent UNITED STATES PATENTS

